JP6206790B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner including a compressor driven by a gas engine.

Conventionally, a gas heat pump type air conditioner in which a compressor is driven by a gas engine is known. In this type of air conditioner, a plate-type heat exchanger that exchanges heat between engine coolant for cooling the gas engine and refrigerant sucked into the compressor is provided in the refrigerant circuit, and the compressor is used during heating operation. In some cases, the efficiency of operation during heating operation is improved by heating the refrigerant sucked into the engine cooling water (see, for example, Patent Document 1).
In addition, this type of air conditioner is equipped with a generator, generates power with the surplus capacity of the gas engine during air conditioning operation, and supplies the power generated by the generator to the fan motor and pump to reduce energy consumption. (For example, see Patent Document 2)

JP 2005-226873 A JP 2007-155165 A

By the way, in the gas heat pump type air conditioner, since exhaust heat of the gas engine can be used, it is generally known that the heating performance is superior to the electric motor heat pump type air conditioner. Yes.
However, during heating operation, when the air conditioning load is large, such as when the outside air temperature is low or the indoor unit operating capacity is large with respect to the outdoor functional force, the refrigerant pressure hardly rises and the load on the gas engine is small. , It will be in a state where there is not much exhaust heat. Thereby, when the air conditioning load is large, there is a problem that the heating performance cannot be expected so much even in the gas heat pump type air conditioner.
An object of this invention is to provide the air conditioning apparatus which can eliminate the subject which the prior art mentioned above has, and can improve heating performance.

In order to solve the above-described problems, the present invention provides an air conditioner including a compressor, a four-way valve, and an outdoor heat exchanger that are driven by a gas engine. And a coolant pressure boosting mechanism that boosts the coolant pressure by heating the coolant in the coolant circuit with the electric power generated by the generator, and includes a coolant circuit that cools the gas engine with engine coolant. The cooling water circuit is provided with a plate heat exchanger for exchanging heat between the engine cooling water and the refrigerant in the refrigerant circuit during heating operation, and the refrigerant pressure boosting mechanism includes the generator A cooling water heater for heating the engine cooling water with electric power of the upstream side of the plate heat exchanger, and the refrigerant circuit on the suction side of the compressor with electric power of the generator The refrigerant heating heater for heating the refrigerant, characterized by comprising downstream of the plate heat exchanger.

  Moreover, the present invention is characterized in that, in the above air conditioner, the refrigerant heating heater is disposed in an accumulator provided on a suction side of the compressor.

  Further, the present invention is characterized in that, in the air conditioning apparatus, at the start of heating operation, when the outside air temperature is equal to or less than a predetermined value set in advance, the power generated by the generator is supplied to the refrigerant pressure boosting mechanism. To do.

  In the air conditioner, when the pressure of the high-pressure refrigerant discharged from the compressor is equal to or lower than a predetermined value when the heating operation is started, the generator generates electric power generated by the generator. It supplies to the said refrigerant | coolant pressure raising mechanism, It is characterized by the above-mentioned.

  According to the present invention, it is provided with a generator that generates electric power from a gas engine, and a refrigerant pressure increasing mechanism that increases the refrigerant pressure by heating the refrigerant in the refrigerant circuit with the electric power generated by the generator, and at the time of starting heating operation Since the electric power generated by the generator according to the load is supplied to the refrigerant pressure boosting mechanism, the electric power generated by the gas engine when the air conditioning load at the start of heating operation is large and the refrigerant pressure is difficult to increase. By increasing the refrigerant pressure, even when the air conditioning load is large, the refrigerant pressure is quickly increased, and the load on the gas engine is increased by the synergistic effect with the power generation load to increase engine exhaust heat, Heating efficiency at the start of operation can be increased, and heating performance can be improved.

It is a figure which shows the structure of the refrigerant circuit of the air conditioning apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of a refrigerant pressure pressurization mechanism, (A) is a figure which shows the structure which arrange | positioned the heater on a refrigerant circuit, (B) is the figure which shows the structure which has arrange | positioned the heater on cooling water piping. It is a flowchart which shows operation | movement of an air conditioning apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a refrigerant circuit of a gas heat pump (GHP) type air conditioner 10 according to an embodiment to which the present invention is applied.
The air conditioner 10 includes an outdoor unit 11 and a plurality of (for example, five) indoor units 12A to 12E, and includes an outdoor refrigerant pipe 13 of the outdoor unit 11 and indoor refrigerant pipes 14A to 14E of the indoor units 12A to 12E. Are connected. In FIG. 1, the refrigerant circuit of the air conditioner 10 is denoted by reference numeral 1, and the engine coolant circuit that cools the gas engine 30 is denoted by reference numeral 43.

  The outdoor unit 11 is installed outside, and a compressor 15 is disposed in the outdoor refrigerant pipe 13, an accumulator 16 is disposed on the suction side of the compressor 15, and an oil separator 17 and a four-way valve 18 are disposed on the discharge side. It is installed. An outdoor heat exchanger 19, an outdoor expansion valve 20, and a dry core 21 are sequentially arranged on the four-way valve 18 side. An outdoor fan (blower fan) 22 that blows air toward the outdoor heat exchanger 19 is disposed adjacent to the outdoor heat exchanger 19. The compressor 15 is connected to the gas engine (engine) 30 via a V-belt 30A that is stretched between a pulley (not shown) on the compressor 15 side and a pulley (not shown) on the gas engine 30 side. And is driven by the gas engine 30.

The oil separator 17 is provided with an oil return pipe 23 for returning the oil separated by the oil separator 17 to the compressor 15. The refrigerant high pressure side (discharge side of the compressor 15) and the refrigerant low pressure side (in the illustrated example, the inlet of the accumulator 16) are connected via a bypass valve 24.
The outdoor refrigerant pipe 13 is provided with closing valves 25A and 25B. Further, the outdoor refrigerant pipe 13 is provided with two liquid pipes 26 </ b> A and 26 </ b> B for appropriately supplying the liquid refrigerant flowing through the outdoor refrigerant pipe 13 to the front of the accumulator 16. Of the two liquid pipes 26A and 26B, one liquid pipe 26A directly supplies the liquid refrigerant flowing through the outdoor refrigerant pipe 13 to the front of the accumulator 16. The other liquid pipe 26B is connected to a plate heat exchanger 48, which will be described later, and the liquid refrigerant flowing through the other liquid pipe 26B is supplied to the front of the accumulator 16 through the plate heat exchanger 48. The

  Indoor unit 12A-12E is installed in each room, indoor heat exchanger 27A-27E arrange | positioned by indoor refrigerant | coolant piping 14A-14E, respectively, and the indoor arrange | positioned in the vicinity of each indoor heat exchanger 27A-27E And expansion valves 28A to 28E. Moreover, indoor fan 29A-29E which ventilates to these indoor heat exchangers 27A-27E is arrange | positioned adjacent to indoor heat exchanger 27A-27E.

The outdoor unit 11 includes a control device 100 that controls the entire air conditioner 10. The control device switches the four-way valve 18 to perform a cooling operation or a heating operation. That is, when the four-way valve 18 is switched to the cooling side, the outdoor heat exchanger 19 functions as a condenser and the indoor heat exchangers 27A to 27E function as an evaporator to enter a cooling operation state, and each indoor heat exchanger 27A to 27A 27E cools the room. Further, when the four-way valve 18 is switched to the heating side, the refrigerant flows as shown by the arrows in FIG. 1, the indoor heat exchangers 27A to 27E function as condensers, and the outdoor heat exchanger 19 functions as an evaporator. It will be in a state and each indoor heat exchanger 27A-27E will heat a room.
Further, during the cooling operation, the respective valve openings of the indoor expansion valves 28A to 28E are controlled according to the air conditioning load. During the heating operation, the opening degrees of the outdoor expansion valve 20 and the indoor expansion valves 28A to 28E are controlled according to the air conditioning load.

On the other hand, an air-fuel mixture of fuel and air is supplied from an engine fuel supply device 31 to the combustion chamber of the gas engine 30 that drives the compressor 15. In this engine fuel supply device 31, a fuel cutoff valve 33, a zero governor 34, a fuel adjustment valve 35, and a throttle 36 are sequentially disposed in a fuel supply pipe 32, and the end of the fuel supply pipe 32 on the throttle 36 side is a gas engine. It is configured to be connected to 30 combustion chambers.
The fuel cut-off valve 33 constitutes a closed type fuel cut-off valve mechanism, and the fuel cut-off valve 33 is fully closed or fully opened, and the cut-off and communication without leakage of the fuel gas are performed alternatively.
The zero governor 34 is the secondary fuel gas pressure (primary pressure) and the secondary fuel gas pressure (secondary pressure) before and after the zero governor 34 in the fuel supply pipe 32 due to fluctuations in the primary pressure. The operation of the gas engine 30 is stabilized by adjusting the pressure to a constant predetermined pressure.

The fuel adjustment valve 35 optimally adjusts the air-fuel ratio of the air-fuel mixture generated by introducing air from the upstream side of the throttle 36. An air supply pipe 37 for sucking air from outside the engine unit is connected to the upstream side of the throttle 36. An air filter 38 is disposed at the suction port of the air supply pipe 37.
An engine oil supply device 39 is connected to the gas engine 30. The engine oil supply device 39 is provided with a constant oil pan 41 having an oil level switch 41A and an oil supply pump 42 provided in an oil supply pipe 40, and appropriately supplies engine oil to the gas engine 30.

Further, the gas engine 30 is cooled by engine cooling water circulating in the engine cooling water circuit 43. The engine cooling water circuit 43 is branched by a first cooling water passage 43A for circulating the cooling water between the radiator 49 and the gas engine 30 and a cooling water three-way valve 47 provided in the first cooling water passage 43A. A second cooling water passage 43 </ b> B that circulates the cooling water between the plate heat exchanger 48 and the gas engine 30 is provided.
The engine cooling water circuit 43 is provided with a reserve tank 55. When the cooling water in the engine cooling water circuit 43 decreases due to water leakage or the like, the internal pressure of the cooling water pipe is reduced to the cooling water. Has been adjusted to automatically replenish by gravity.

  The cooling water three-way valve 47 is a flow-regulated three-way valve that guides the flowing high-temperature engine cooling water to either the radiator 49 or the plate heat exchanger 48 or to both by changing the diversion ratio. A cooling water outlet of the gas engine 30 is connected to an inlet 47A of the cooling water three-way valve 47 via a cooling water pipe. A plate-type heat exchanger 48 is connected to one outlet 47B of the cooling water three-way valve 47 via a cooling water pipe, and to the other outlet 47C of the cooling water three-way valve 47 via a cooling water pipe. A radiator 49 is connected. The cooling water three-way valve 47 is driven by a motor (not shown), and this motor is controlled by a control device (not shown).

  The engine cooling water that has passed through the radiator 49 and / or the plate heat exchanger 48 is supplied to the gas engine 30 through a cooling water pipe in which a circulation pump 46 and an exhaust gas heat exchanger 50 are sequentially connected. Guided to the cooling water inlet. The circulation pump 46 discharges engine cooling water during operation and circulates the engine cooling water in the engine cooling water circuit 43.

  The exhaust gas heat exchanger 50 is connected to a muffler 51, an exhaust top 52, and a neutralizing device 54 for processing and discharging the exhaust gas that has passed through the exhaust gas heat exchanger 50. The exhaust side of the exhaust gas heat exchanger 50 and the intake side of the muffler 51 are connected via an exhaust pipe 53 (including an exhaust hose), and the exhaust including the drain discharged from the exhaust gas heat exchanger 50. The gas flows into the muffler 51 through the exhaust pipe 53. The exhaust gas collides with a silencer (not shown) in the muffler 51 and is silenced, and moisture in the exhaust gas collides with the silencer and becomes drain water.

  The exhaust gas that has passed through the muffler 51 flows into the exhaust top 52. The exhaust gas is cooled in the exhaust top 52, moisture in the exhaust gas is condensed and drainage is generated, and the final exhaust gas is exhausted. The air is exhausted outside through the top 52. Drain generated inside the exhaust top 52 is returned to the muffler 51 via a return hose (not shown) and guided to the neutralization device 54. The neutralizer 54 neutralizes harmful substances such as SOx and NOx in the exhaust gas contained in the drain.

  The radiator 49 cools the engine coolant, and is disposed adjacent to the outdoor fan 22 so that the blown air of the outdoor fan 22 is supplied. The engine cooling water cooled by the radiator 49 is returned to the gas engine 30 by the circulation pump 46 via the exhaust gas heat exchanger 50, and the gas engine 30 is cooled.

  The plate heat exchanger 48 exchanges heat between the refrigerant in the refrigerant circuit 1 and the cooling water in the engine cooling water circuit, and the engine cooling water is heated by the heat of the gas engine 30. This is a cooling water / refrigerant heat exchanger for heating. The plate heat exchanger 48 is an exhaust gas heat recovery heat exchanger that enhances the heating capacity by allowing the liquid refrigerant flowing in the outdoor refrigerant pipe 26B to recover the exhaust heat of the gas engine 30. In particular, when the outside air temperature is low (for example, 0 ° C. or less), the outdoor heat exchanger 19 may not be able to sufficiently exchange heat between the outside air and the refrigerant. Therefore, the plate heat exchanger 48 is used as a sub-evaporator. By functioning, the heating capacity can be maintained and enhanced. Accordingly, the plate heat exchanger 48 is mainly used during heating operation. The outside air temperature is detected by, for example, the outside air temperature sensor 101 provided in the air path of the outdoor fan 22, and the detection result is input to the control device 100.

  A generator 73 is connected to the output shaft 71 of the gas engine 30. The generator 73 is connected to the gas engine 30 via a V-belt 72 that is stretched between a pulley (not shown) on the generator 73 side and a pulley (not shown) on the output shaft 71 side of the gas engine 30. And is driven by the gas engine 30. The electric power generated by the generator 73 is supplied to load devices such as the outdoor fan 22 and the circulation pump 46. Thereby, the amount of power supplied to the load device can be reduced, and the energy consumption can be reduced.

  By the way, when the outside air temperature is low (for example, −5 ° C. or lower) and the air conditioning load is large at the start of the heating operation, the outdoor heat exchanger 19 cannot obtain heat from the outside air, and the refrigerant pressure increases. It becomes difficult. Whether or not the refrigerant pressure is unlikely to rise is determined by the detection value of the high pressure sensor 102 provided on the refrigerant discharge side of the compressor 15 or the detection value of the high pressure sensor 102 and the compressor 15. Detection is possible based on the difference from the detection value of the low-pressure sensor 103 provided on the refrigerant suction side. The detection values of the high pressure sensor 102 and the low pressure sensor 103 are input to the control device 100, and the control device 100 is in a state in which the refrigerant pressure is unlikely to increase based on the detection values of these sensors. Judge whether or not.

When the refrigerant pressure is difficult to increase, the load applied to the gas engine 30 is reduced, so that the engine exhaust heat is not generated so much. Therefore, the heating capacity cannot be increased by the function of the plate heat exchanger 48.
Therefore, the air conditioning apparatus 10 of the present embodiment includes a refrigerant pressure boosting mechanism 60 that boosts the refrigerant pressure by heating the refrigerant absorbed by the compressor 15 and increases the load on the gas engine 30 as a result. It has been.

The refrigerant pressure increasing mechanism 60 includes a refrigerant heating heater 61 that increases the refrigerant pressure by directly heating the refrigerant in the refrigerant circuit 1. The refrigerant pressure boosting mechanism 60 heats the engine cooling water in the engine cooling water circuit 43 to indirectly heat the refrigerant in the refrigerant circuit 1 via the plate heat exchanger 48. The structure provided with the heater 62 may be sufficient.
The refrigerant heating heater 61 is provided in the liquid pipe 26 </ b> B that appropriately supplies the refrigerant before the accumulator 16 via the plate heat exchanger 48. The refrigerant heating heater 61 is desirably provided downstream of the plate heat exchanger 48. The refrigerant evaporated by exchanging heat with the engine coolant in the plate heat exchanger 48 is further heated by the refrigerant heating heater 61 and supplied to the compressor 15 in a state where the refrigerant pressure is increased.

Thus, the refrigerant pressure increasing mechanism 60 includes the refrigerant heating heater 61 on the suction side of the compressor 15, and the refrigerant heated by the refrigerant heating heater 61 and having the increased refrigerant pressure is sucked into the compressor 15. Thereby, the load concerning the gas engine 30 can be enlarged and the heating capacity by engine exhaust heat can be enhanced.
The refrigerant heater 61 may be built in a container (not shown) provided in the liquid pipe 26B and may heat the refrigerant guided into the container, or FIG. As shown to A), the structure incorporated in the accumulator 16 may be sufficient.

  The cooling water heater 62 is provided in the engine cooling water circuit 43 between the cooling water outlet of the gas engine 30 and the cooling water three-way valve 47. The refrigerant pressure increasing mechanism 60 heats the engine coolant flowing through the engine coolant circuit 43 by the coolant heater 62. The engine coolant heated by the coolant heater 62 passes through the coolant three-way valve 47 and is circulated to the second coolant passage 43B connected to the plate heat exchanger 48. Then, heat is exchanged with the refrigerant in the refrigerant circuit 1 via the plate heat exchanger 48. Thus, the refrigerant flowing through the refrigerant circuit 1 via the plate heat exchanger 48 is heated by the engine cooling water, and the refrigerant pressure is increased. For example, as shown in FIG. 2B, the heater 62 for cooling water heating is an elbow pipe 63 provided in a cooling water pipe connecting the cooling water outlet of the gas engine 30 and the cooling water three-way valve 47. It may be a configuration built in the.

  An electric wire 64 for supplying the electric power generated by the generator 73 to the refrigerant heating heater 61 and the cooling water heating heater 62 is connected to the refrigerant heating heater 61 and the cooling water heating heater 62. The refrigerant heating heater 61 and the cooling water heating heater 62 are driven by the electric power generated by the generator 73 when the refrigerant pressure is unlikely to rise, such as when the outside air temperature is low at the start of heating operation. It is used to heat the refrigerant and increase the refrigerant pressure sucked into the compressor 15.

Next, operation | movement of the air conditioning apparatus 10 at the time of heating operation start is demonstrated using the flowchart of FIG.
When the heating operation is started, first, the control device 100 of the outdoor unit 11 acquires the detection value of the outside air temperature sensor 101 (step S1). Then, the control device 100 determines whether or not the value indicating the outside air temperature detected by the outside air temperature sensor 101 is a predetermined value set in advance (step S2). For example, the predetermined temperature is set to −5 ° C. or less at which the outdoor heat exchanger 19 cannot obtain heat from the outside air. When it is determined that the outside air temperature is higher than the predetermined value (step S2: No), the control device 100 does not supply the electric power generated by the generator 73 to the refrigerant pressure boosting mechanism 60, and the outdoor fan 22 and the circulation A normal operation for supplying to the pump 46 and the like is performed (step S7).

  On the other hand, when it is determined that the outside air temperature detected by the outside air temperature sensor 101 is equal to or lower than the predetermined value (step S2: Yes), the control device 100 subsequently determines the pressure of the high-pressure refrigerant detected by the high-pressure sensor 102. Detect (step S3). The control device 100 determines whether or not the pressure of the high-pressure refrigerant is equal to or lower than a predetermined value set in advance (step S4). When it is determined that the pressure of the high-pressure refrigerant is higher than the predetermined value (step S4: No), the control device 100 does not supply the electric power generated by the generator 73 to the refrigerant pressure boosting mechanism 60, and the outdoor fan 22 And normal operation for supplying to the circulation pump 46 and the like is performed (step S7).

  When it is determined that the pressure of the high-pressure refrigerant is equal to or lower than the predetermined value (step S4: Yes), the control device 100 supplies the electric power generated by the generator 73 to the refrigerant pressure boosting mechanism 60 (step S5). That is, when the outside air temperature and the pressure of the high-pressure refrigerant are low and the air conditioning load is large, the control device 100 supplies the electric power generated by the generator 73 to the refrigerant pressure boosting mechanism 60. As a result, the refrigerant pressure of the refrigerant sucked into the compressor 15 can be preliminarily raised by heating with the refrigerant heating heater 61 and / or the cooling water heating heater 62. Therefore, using the electric power generated by the generator 73, the refrigerant pressure can be quickly increased to improve the heating performance at the start of the heating operation. Further, by increasing the refrigerant pressure using the electric power generated by the generator 73, the load applied to the gas engine 30 can be quickly increased, and the engine exhaust heat can be efficiently generated. Even if it is low, the heating performance using engine exhaust heat can be improved.

  As described above, according to the embodiment to which the present invention is applied, the air including the refrigerant circuit 1 formed by connecting the compressor 15 driven by the gas engine 30, the four-way valve 18, and the outdoor heat exchanger 19. The harmony device 10 includes a generator 73 that generates power from the gas engine 30 and a refrigerant pressure boosting mechanism 60 that boosts the refrigerant pressure by heating the refrigerant in the refrigerant circuit 1 with the electric power generated by the generator 73. At the start of operation, electric power generated by the generator 73 according to the load is supplied to the refrigerant pressure raising mechanism 60. According to this configuration, when the air conditioning load is large and the refrigerant pressure is difficult to increase at the start of the heating operation, the refrigerant pressure increasing mechanism 60 generates the electric power generated by the generator 73 that generates power from the gas engine 30. The refrigerant pressure of the refrigerant in the refrigerant circuit 1 can be quickly increased. Thereby, the heating performance at the time of a heating operation start can be improved. In addition, the load applied to the gas engine 30 can be increased quickly so that the engine exhaust heat can be efficiently generated. Even when the outside air temperature is low, the heating performance using the engine exhaust heat can be improved. Improvements can be made.

  Further, according to the embodiment to which the present invention is applied, the refrigerant pressure boosting mechanism 60 has the refrigerant heating heater 61 that directly heats the refrigerant in the refrigerant circuit 1 by the electric power of the generator 73 on the suction side of the compressor 15. Prepared. According to this configuration, the refrigerant pressure of the refrigerant can be increased in advance and supplied to the suction port of the compressor 15, and the load applied to the gas engine 30 is increased so that the engine exhaust heat is efficiently generated. Can do. Thereby, even if it is a case where outside temperature is low, the improvement of the heating performance using engine exhaust heat can be aimed at.

  According to the embodiment to which the present invention is applied, the engine cooling water circuit 43 that cools the gas engine 30 with the engine cooling water is provided, and the engine cooling water and the refrigerant circuit are provided in the engine cooling water circuit 43 during the heating operation. A plate heat exchanger 48 for exchanging heat with the refrigerant in 1 is provided, and the refrigerant pressure boosting mechanism 60 uses a plate-type heat for the cooling water heating heater 62 that heats the cooling water by the electric power of the generator 73. Provided upstream of exchanger 48. According to this configuration, the engine cooling water supplied to the plate heat exchanger 48 is heated by the cooling water heater 62 and the plate heat exchanger 48 is heated by the engine cooling water heated by the cooling water heater 62. The refrigerant flowing through can be indirectly heated. Therefore, by using the plate heat exchanger 48 to heat the refrigerant with the electric power of the generator 73 to increase the refrigerant pressure, the load on the gas engine 30 combined with the power generation load can be increased, and the outside air temperature Even if it is low, the heating performance using engine exhaust heat can be improved.

  Moreover, according to the embodiment to which the present invention is applied, the refrigerant heating heater 61 is disposed in the accumulator 16 provided on the suction side of the compressor 15, so that the refrigerant is heated in the accumulator and the refrigerant pressure is increased. Can be supplied to the compressor 15. Thereby, the load applied to the gas engine 30 can be increased, and the engine exhaust heat can be efficiently generated. Thereby, even if it is a case where outside temperature is low, the improvement of the heating performance using engine exhaust heat can be aimed at. Further, it is not necessary to connect another container containing the refrigerant heating heater 61 in the refrigerant circuit 1, and the refrigerant heating heater 61 can be easily arranged.

  Further, according to the embodiment to which the present invention is applied, the electric power generated by the generator 73 is supplied to the refrigerant pressure boosting mechanism 60 when the outside air temperature is equal to or lower than a predetermined value at the start of heating operation. According to this configuration, when the outside air temperature is low and the air conditioning load is large, the power generated by the generator 73 that generates power by the gas engine 30 is supplied to the refrigerant pressure boosting mechanism 60, and the refrigerant of the refrigerant in the refrigerant circuit 1. The pressure can be quickly increased. Thereby, the heating performance at the time of a heating operation start can be improved. In addition, the load applied to the gas engine 30 can be increased quickly so that the engine exhaust heat can be efficiently generated. Even when the outside air temperature is low, the heating performance using the engine exhaust heat can be improved. Improvements can be made.

  Further, according to the embodiment to which the present invention is applied, when the heating operation is started, the generator 73 generates power when the pressure of the high-pressure refrigerant discharged from the compressor 15 is equal to or lower than a predetermined value set in advance. Electric power is supplied to the refrigerant pressure raising mechanism 60. According to this configuration, when the pressure of the high-pressure refrigerant discharged from the compressor 15 is low and the load applied to the gas engine 30 is low, the refrigerant pressure is increased to increase the load on the gas engine 30. it can. Therefore, the load of the gas engine 30 can be increased, and the engine exhaust heat can be efficiently generated, and the heating performance using the engine exhaust heat can be improved.

DESCRIPTION OF SYMBOLS 1 Refrigerant circuit 10 Air conditioning apparatus 11 Outdoor unit 15 Compressor 16 Accumulator 18 Four-way valve 19 Outdoor heat exchanger 30 Gas engine 43 Engine cooling water circuit 48 Plate type heat exchanger 60 Refrigerant pressure raising mechanism 61 Refrigerant heating heater 62 Cooling water Heating heater 73 Generator 100 Controller 101 Outside air temperature sensor 102 High pressure sensor 103 Low pressure sensor

Claims (4)

In an air conditioner including a refrigerant circuit formed by connecting a compressor driven by a gas engine, a four-way valve, and an outdoor heat exchanger,
A generator for generating electricity by the gas engine, and a refrigerant pressure increasing mechanism for increasing the refrigerant pressure by heating the refrigerant in the refrigerant circuit with the electric power generated by the generator,
A cooling water circuit for cooling the gas engine with engine cooling water is provided, and in the cooling water circuit, heat exchange is performed between the engine cooling water and the refrigerant in the refrigerant circuit during heating operation. Vessel is provided,
The refrigerant pressure boosting mechanism includes a cooling water heating heater that heats the engine cooling water with electric power of the generator upstream of the plate heat exchanger, and a suction side of the compressor with electric power of the generator An air conditioner comprising a refrigerant heating heater for heating the refrigerant in the refrigerant circuit, downstream of the plate heat exchanger . The air conditioner according to claim 1 , wherein the refrigerant heating heater is disposed in an accumulator provided on a suction side of the compressor. 3. The air conditioning according to claim 1, wherein when the outside air temperature is equal to or lower than a predetermined value at the start of heating operation, the electric power generated by the generator is supplied to the refrigerant pressure increasing mechanism. apparatus. When the heating operation is started, if the pressure of the high-pressure refrigerant discharged from the compressor is equal to or lower than a predetermined value set in advance, power generated by the generator is supplied to the refrigerant pressure boosting mechanism. The air conditioning apparatus according to any one of claims 1 to 3 .

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